The combination of TETS and TET will get you pretty much from Florida to Northern Maine. There's a sticky in the east coast GPS forum. If you search around, you'll find ride reports for at least parts of it.

Depending on how much time you have, an alternative once you get to VT is try Dockingpilot's gpx tracks. You may want to pm him for those, or search the ride reports.

I haven't ridden either but am gearing up for both (FL to NB back to FL) either next month or August so I can't vouch. But TET and TETS get tons of hits and Dockingpilot's rr is so good I have no doubts about it.